linux-kernel - Re: [BUG] 4.17-rcX delays during boot and memory mapping errors

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Date:   Sun, 20 May 2018 23:28:54 -0500
From:   Bob Tracy <rct@...rkin.frus.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [BUG] 4.17-rcX delays during boot and memory mapping errors

On Fri, May 18, 2018 at 07:32:59PM -0500, Bob Tracy wrote:
> Every one of the 4.17-rcX series has hung during boot at the point where
> "acpid" starts up.  Beginning with -rc5, the boot actually proceeds to
> completion after an "uncomfortably" long delay.
> 
> Attempting to run the X11 server results in the following diagnostic
> output in "/var/log/Xorg.0.log":

v4.17-rc6 took care of the X11 server startup issue.  The
"uncomfortably" long delay issue persists.  An observation as far as
differences between 4.16 and 4.17-rc6 during startup...

In v4.16 and earlier kernels, I wouldn't see the "random: crng init done"
message until moments after the system was done transitioning to multi-
user mode ("login" prompt on the console).  In the v4.17-rcX series, I
don't see a login prompt until all the events represented in the "dmesg"
output below have occurred:

(...)
[    7.314001] NET: Registered protocol family 10
[    7.315781] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    7.317359] Segment Routing with IPv6
[    8.667444] NET: Registered protocol family 17
[    9.130872] e1000e: eth0 NIC Link is Up 10 Mbps Half Duplex, Flow
Control: None
[    9.131839] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO
[    9.136947] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   78.567150] random: crng init done
[  102.974609] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[  102.982063] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[  102.983716] r8152 2-1.5:1.0 eth1: carrier on
(end of dmesg output)

As far as what I see on the console during bootup, I see the
"IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready" message, then
the system "hangs" until the "random: crng init done" message appears.
Then "acpid" startup and other events proceed normally.

Any idea what's going on here?

--Bob